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Re: Replace colors in an image

by zentara (Archbishop)
on Oct 04, 2005 at 21:04 UTC ( #497408=note: print w/ replies, xml ) Need Help??

in reply to Replace colors in an image

Imager is pretty good for that. For an example of manipulation see Tk ImageMap-color-zones. That just tints images. To replace some color, you could go thru every pixel, test for the rgb value to change, then adjust each pixel. I don't see anyway other than going thru the image pixel by pixel. Tinting is fast. Testing each pixel is slow.

Here is a snippet to get pixel rgb values with GD, and I'm sure Imager has a similar method.

#!/usr/bin/perl use GD; my $image = newFromPng GD::Image('z.png'); ($x,$y)=$image->getBounds(); $maxColors = $image->colorsTotal; $pixel=$image->getPixel(23,34); ($r,$g,$b)=$image->rgb($pixel); print "$r\t$g\t$b\n";
And check out gif colour changes

I'm not really a human, but I play one on earth. flash japh

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